自行车产品是实施生产许可证明管理的。目前,中国自行车行业中有整车厂400多家,到目前为止共有249家企业取得了生产许可证,但是,据悉有许多企业在无证情况下进行生产。为了解行业中无证生产和产品质 Bicycle products are managed with production licenses. At present, there are more than 400 automakers in China’s bicycle industry. A total of 249 companies have obtained production licenses so far. However, it is reported that many companies are producing without warrants. To understand the unlicensed production and product quality in the industry